bill: part of president obama's healthcare law is quieting kicking in for millions of seniors. what happens if medicare patients need to go back to the hospital for care. martha: can a recent spike on these horrible attacks in afghanistan force our troops to get out of afghanistan earlier? we'll talk to jack keane about that. we'll be right back. martha: 20 people have been hurt in california after a truck slammed into an amtrak train. most of the injuries are said to be minor. >> the train started going down. the noise was extra loud. and smoke -- we thought it was smoke about it was dust. >> my mother called hysterically that the strain overturned. and my niece and her newborn baby are on that train. martha: police say it did occur at a crossing equipped with gates to stop traffic. bill: millions of americans can be affected by a little known piece of the president's healthcare law. hospitals face big fines if medicare patients have to be readmitted within 30 days. one in five medicare patients have to go back to the hospital for care. dr. siegel, good morning to you. what wa